技术文摘 关键词:水溶性大豆多糖，超声波，超声波酶法 [gap=1225]Key words：water soluble soybean polysaccharide;ultrasonic sound;ultrasonic-enzymatic extraction
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ultrasonic sound apparatus 超声波器
ultrasonic sound appratus [声] 超声波器
ultrasonic sound detector 超声波探测仪
ultrasonic sound velocity 超声声速
ultrasonic sound frequency 超声频率
ultrasonic sound intensity 超声波声强
Plants that were in no immediate danger gave out less than one ultrasonic sound per hour.
那些不受直接威胁的植物每小时发出的超声波不到一次。
So if you're standing in front of the ultrasonic sound wave, you can hear the sound.
所以如果你站在超音速声波的前面，你能听到声音。
If there is no ultrasonic sound in the received signal, the maximal value is not in order.
而当回波中没有超声信号时，相关值的极大值没有固定规律。
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